1,720,990 research outputs found
Lithium salt additives and the influence of their counterion on the performances of light-emitting electrochemical cells
No full text[EN] In this work we study the effect of the addition of lithium salts to light-emitting electrochemical cells (LECs), and in particular the effect of the lithium counterion. We found that the chosen lithium salts can substantially improve the device turn-on time as well as the overall lifetime, with respect to reference LECs using the pure emitter. A correlation between the lithium counterion and the corresponding device performance is established, and efficient LECs with lifetimes approaching 2000 hours are presented.We acknowledge financial support from the European Union H2020 project INFORM (grant 675867), the Spanish Ministry of Economy and Competitiveness (MINECO) via the Unidad de Excelencia Maria de Maeztu MDM-2015-0538, MAT2014-55200 and PCIN-2015-255 and the Generalitat Valenciana (Prometeo/2012/053). M. S. and E. B. thank the MINECO for their post-doctoral (JdC) and pre-doctoral grants, respectively.Bandiello, Enrico;Sessolo, M.;Bolink, HJ. (2016). Lithium salt additives and the influence of their counterion on the performances of light-emitting electrochemical cells. Journal of Materials Chemistry C. 4(46):10781-10785. https://doi.org/10.1039/C6TC03597CS107811078544
Aqueous electrolyte-gated ZnO transistors for environmental and biological sensing
No full text[EN] Electrolyte-gated transistors (EGTs) based on ZnO thin films, obtained by solution processing of suspensions of nanoparticles, have a low turn-on voltage (<0.5 V), a high on/off ratio and transconductance exceeding 0.2 mS. Importantly, the ZnO surface can be functionalized with a large variety of molecular recognition elements, making these devices ideal transducers in physiological and environmental monitoring. We present simple glucose-sensing and ion-selective EGTs, demonstrating the versatility of such devices in biosensing.This work has been supported by the European Union (HYSENS, Grant STRP 263091), the Spanish Ministry of Economy and Competitiveness (MINECO) (MAT2011-24594), and the Generalitat Valenciana (Prometeo/2012/053). E. B. acknowledges MINECO for an FPI grant. The authors thank Jorge Ferrando and Alejandra Soriano for technical assistance in the characterization of the transistors and XRD measurements.Bandiello, Enrico;Sessolo, M.;Bolink, HJ. (2014). Aqueous electrolyte-gated ZnO transistors for environmental and biological sensing. Journal of Materials Chemistry C. 2(48):10277-10281. https://doi.org/10.1039/C4TC02075HS102771028124
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Structure-luminescence correlations in europium-doped sol-gel ZnO nanopowders
No full textThe present study, focused on the sol-gel synthesis of rare-earth-doped zinc oxide, highlights the crucial points involved in the design and development of ZnO/Eu nanosystems. with peculiar and easily tunable photophysical. properties. ZnO nanopowders containing different europium amounts were prepared starting from zinc and europium acetate salts as the sol precursors. The densification process and the evolution of the structural-optical properties were studied as a function of annealing performed in air between 100 and 1000 degrees C. The microstructure and composition of the samples and their dependence on the synthesis procedure were investigated by X-ray diffraction and X-ray photoelectron spectroscopy, whereas the emission properties were studied by photoluminescence spectroscopy in the energy and time domains as a function of the structural evolution. Crystalline ZnO powders in the wurtzite structure were formed after heat treatment at 400 degrees C, with an average nanocrystal size of ca. 20 nm. Stronger annealing conditions allowed a more extended densification of the oxide-based network and the removal of most -OH groups but also promoted the crystallization of EU2O3 at 800 degrees C. The most intense emission bands around 600 nm due to Eu3+ transitions were clearly observed in the annealed samples (T >= 600 degrees C). Interestingly, the observed overlap of the typical Eu3+ red emission with the characteristic green luminescence of the nanostructured ZnO matrix can be synergistically exploited for single or multicolor emission through the proper choice of the excitation wavelength
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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